/* Implementation of match_cidr call
   Copyright (C) 2007-2020 Sergey Poznyakoff

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>. */

module 'match_cidr'.

require 'status'

#pragma regex push +extended

func match_cidr(string ipstr, string cidr)
  returns number
do
  number netmask

  if cidr matches '^(([0-9]{1,3}\.){3}[0-9]{1,3})/([0-9][0-9]?)'
    return inet_aton(ipstr) & len_to_netmask(\3) = inet_aton(\1)
  else
    throw e_invcidr "invalid CIDR (%cidr)"
  fi
  return 0
done

#pragma regex pop